In-device coexistence interference report control method and apparatus of network in mobile communication system

ABSTRACT

An in-device coexistence interference report control method of a network for terminal to inform the network of interference among heterogeneous radio communication modules coexisting in the terminal is provided. The method includes determining, at a terminal when a terminal capability enquiry message is received from a base station, whether the base station supports an In-Device Coexistence (IDC) interference report, transmitting, when the IDC interference report is supported, a terminal capacity information message to the base station, receiving a Radio Resource Control (RRC) connection reconfiguration message including information on whether terminal&#39;s IDC interference indicator transmission is permitted from the base station; and transmitting an RRC connection reconfiguration complete message to the base station in response to the RRC connection reconfiguration message. The in-device coexistence interference indication control method is advantageous in preventing the UE from transmitting useless in-device coexistence interference indication messages, resulting in reduction of unnecessary signaling.

CROSS-REFERENCE TO RELATED APPLICATION(S)

This application is a continuation application of a prior applicationSer. No. 14/638,409 filed on Mar. 4, 2015, which is a continuationapplication of a prior application Ser. No. 13/758,132, filed on Feb. 4,2013 in the U.S. Patent and Trademark Office, which has issued as U.S.Pat. No. 8,983,448 on Mar. 17, 2015, and which claimed the benefit under35 U.S.C. §119(e) of a U.S. Provisional application filed on Feb. 6,2012 in the U.S. Patent and Trademark Office and assigned Ser. No.61/595,646, the entire disclosure of each of which is herebyincorporated by reference.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a mobile communication system. Moreparticularly, the present invention relates to an in-device coexistenceinterference report control method of a network in a mobilecommunication system, the in-device coexistence interference beingreported by the terminal to inform the network of interference amongheterogeneous radio communication modules coexisting in the terminal.

2. Description of the Related Art

With rapid advances in radio communication technology, the communicationsystem has evolved to meet the requirements of 4th Generation (4G)mobile communication technology such as Long Term Evolution (LTE).

The widespread use of smartphones has increased demand for supplementarywireless technologies such as Wireless Local Area Network (WLAN),Bluetooth, and Global Positioning System (GPS). In order to meet thisdemand, several communication technologies (e.g., cellular technology(LTE/UMTS), WLAN, Bluetooth, and GNSS/GPS) are being integrated into asingle portable device. As a consequence, inter-technology interferenceproblem is emerging as a key issue to be solved. This issue is underdiscussion in the name of In-Device Coexistence (IDC) in the 3rdGeneration Partnership Project (3GPP).

The LTE/UMTS communication technology operates on various frequencybands while the Bluetooth and WLAN operate on the Industrial, Scientificand Medical (ISM) band of 2400˜2483.5 MHz. Among the frequency bandsassigned for the LTE/UMTS communication, Band 4 (2300˜2400 MHz) and Band7 uplink (2500˜2670 MHz) are close to the ISM band used by Bluetooth andWLAN such that the simultaneous operations of the two technology modulescause significant interference to each other, e.g. a signal transmittedby one communication technology module may be received by the othercommunication technology module in the same device.

This interference can be mitigated in such a way that the terminalreports the interference to the network and thus the network commandshandover of the terminal to use another frequency. However, if thenetwork does not understand the interference report message, this meansthat the terminal transmits the interference report message uselessly,resulting in increase of unnecessary signaling. There is therefore aneed of a method to address this issue.

The above information is presented as background information only toassist with an understanding of the present disclosure. No determinationhas been made, and no assertion is made, as to whether any of the abovemight be applicable as prior art with regard to the present invention.

SUMMARY OF THE INVENTION

Aspects of the present invention are to address at least theabove-mentioned problems and/or disadvantages and to provide at leastthe advantages described below. Accordingly, an aspect of the presentinvention has been conceived to solve the problems of the prior art andit is an object of the present invention to provide a method forpreventing a terminal equipped multiple heterogeneous communicationmodules (e.g. 3G/4G cellular communication module, Wireless Local AreaNetwork (WLAN) module, Bluetooth module, Global Positioning System (GPS)module, etc.) from transmitting in-device coexistence interferencereport unnecessarily.

According to an aspect of the present invention, the network controlsthe IDC interference problem report as follows.

1. The User Equipment (UE) reports device capability including theinformation on whether the UE supports In-Device Coexistence (IDC)interference indicator transmission.

2. The evolved Node B (eNB) transmits to the UE a Radio Resource Control(RRC) connection reconfiguration message informing on whether IDCinterference indicator transmission is permitted.

a. Indicator indicating whether IDC interference indicator transmissionis permitted

b. If permitted, information on the frequency to which the indicator isapplied (e.g. send IDC interference indication on only frequency X)

3. The UE transmits IDC interference indicator only when it is permitted

4. The target eNB determines whether to transmit IDC interferenceindicator transmission, including step 2, in Handover command.

In accordance with an aspect of the present invention, a control messagetransmission method of a terminal in a mobile communication system isprovided. The method includes determining, when a terminal capabilityenquiry message is received from a base station, whether the basestation supports an IDC interference report, transmitting, when the IDCinterference report is supported, a terminal capacity informationmessage to the base station, receiving an RRC connection reconfigurationmessage including information on whether terminal's IDC interferenceindicator transmission is permitted from the base station; andtransmitting an RRC connection reconfiguration complete message to thebase station in response to the RRC connection reconfiguration message.

In accordance with another aspect of the present invention, a method fora base station to control terminal's control message transmission in amobile communication system is provided. The method includestransmitting a terminal capability enquiry message to the terminal todetermine terminal capability, determining, when a terminal capabilityinformation message is received from the terminal, whether the terminalcapability information message includes an In-Device Coexistence (IDC)interference report capability indicator, determining, when the IDCinterference report capability indicator is included, whether to permitthe IDC interference indicator transmission; and transmitting, when theIDC interference indicator transmission is permitted, to the terminal aRadio Resource Control (RRC) connection reconfiguration messageincluding information on whether the IDC interference indicatortransmission is permitted.

In accordance with another aspect of the present invention, a terminalfor transmitting a control message in a mobile communication system isprovided. The terminal includes a transceiver for communicating with abase station, and a controller for controlling determining, when aterminal capability enquiry message is received from a base station,whether the base station supports an In-Device Coexistence (IDC)interference report, transmitting, when the IDC interference report issupported, a terminal capacity information message to the base station,receiving a Radio Resource Control (RRC) connection reconfigurationmessage including information on whether terminal's IDC interferenceindicator transmission is permitted from the base station, andtransmitting an RRC connection reconfiguration complete message to thebase station in response to the RRC connection reconfiguration message.

In accordance with another aspect of the present invention, a basestation for controlling control message transmission of a terminal in amobile communication system is provided. The base station includes atransceiver for communicating with a terminal and other nodes ofwireless communication systems, and a controller for controllingtransmitting a terminal capability enquiry message to the terminal tocheck terminal capability, determining, when a terminal capabilityinformation message is received from the terminal, whether the terminalcapability information message includes an In-Device Coexistence (IDC)interference report capability indicator, determining, when the IDCinterference report capability indicator is included, whether to permitthe IDC interference indicator transmission, and transmitting, when theIDC interference indicator transmission is permitted, to the terminal aRadio Resource Control (RRC) connection reconfiguration messageincluding information on whether the IDC interference indicatortransmission is permitted.

Other aspects, advantages, and salient features of the invention willbecome apparent to those skilled in the art from the following detaileddescription, which, taken in conjunction with the annexed drawings,discloses exemplary embodiments of the invention.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other aspects, features, and advantages of certainexemplary embodiments of the present invention will be more apparentfrom the following description taken in conjunction with theaccompanying drawings, in which:

FIG. 1 is a diagram illustrating an architecture of a Long TermEvolution (LTE) system according to an exemplary embodiment of thepresent invention;

FIG. 2 is a diagram illustrating a protocol stack of an LTE systemaccording to an exemplary embodiment of the present invention;

FIG. 3 is a diagram illustrating frequency bands fur use in current3^(rd) Generation Partnership Project (3GPP) cellular communicationsystems that are adjacent to the Industrial, Scientific, and Medical(ISM) band according to an exemplary embodiment of the presentinvention;

FIG. 4 is a signal flow diagram illustrating signal flows of anin-device coexistence interference indication control method accordingto an exemplary embodiment of the present invention;

FIG. 5 is a flowchart illustrating a UE procedure of an in-devicecoexistence interference indication control method according to anexemplary embodiment of the present invention;

FIG. 6 is a flowchart illustrating an eNB procedure of an in-devicecoexistence interference indication control method according to anexemplary embodiment of the present invention;

FIG. 7 is a block diagram illustrating a configuration of a UE accordingto an exemplary embodiment of the present invention; and

FIG. 8 is a block diagram illustrating a configuration of an eNBaccording to an exemplary embodiment of the present invention.

Throughout the drawings, it should be noted that like reference numbersare used to depict the same or similar elements, features, andstructures.

DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS

The following description with reference to the accompanying drawings isprovided to assist in a comprehensive understanding of exemplaryembodiments of the invention as defined by the claims and theirequivalents. It includes various specific details to assist in thatunderstanding but these are to be regarded as merely exemplary.Accordingly, those of ordinary skill in the art will recognize thatvarious changes and modifications of the embodiments described hereincan be made without departing from the scope and spirit of theinvention. In addition, descriptions of well-known functions andconstructions may be omitted for clarity and conciseness.

The terms and words used in the following description and claims are notlimited to the bibliographical meanings, but, are merely used by theinventor to enable a clear and consistent understanding of theinvention. Accordingly, it should be apparent to those skilled in theart that the following description of exemplary embodiments of thepresent invention is provided for illustration purpose only and not forthe purpose of limiting the invention as defined by the appended claimsand their equivalents.

It is to be understood that the singular forms “a,” “an,” and “the”include plural referents unless the context clearly dictates otherwise.Thus, for example, reference to “a component surface” includes referenceto one or more of such surfaces.

FIG. 1 is a diagram illustrating the architecture of a Long TermEvolution (LTE) system according to an exemplary embodiment of thepresent invention.

Referring to FIG. 1, the radio access network of the LTE system includesevolved Node Bs (eNBs) 105, 110, 115, and 120, a Mobility ManagementEntity (MME) 125, and a Serving-Gateway (S-GW) 130. The User Equipment(UE) 135 connects to an external network via eNBs 105, 110, 115, and 120and the S-GW 130.

In FIG. 1, the eNBs 105, 110, 115, and 120 correspond to legacy node Bsof Universal Mobile Communications System (UMTS). The eNBs 105, 110,115, and 120 allow the UE establish a radio link and are responsible forcomplicated functions as compared to the legacy node B. In the LTEsystem, all the user traffic including real time services such as Voiceover Internet Protocol (VoIP) are provided through a shared channel andthus there is a need of a device located in the eNB to schedule databased on the state information, such as UE buffer conditions, powerheadroom state, and channel state. In order to meet a data rate of up to100 Mbps, the LTE system adopts Orthogonal Frequency DivisionMultiplexing (OFDM) as a radio access technology. Also, the LTE systemadopts Adaptive Modulation and Coding (AMC) to determine the modulationscheme and channel coding rate in adaptation to the channel condition ofthe UE. The AMC is a technique for determining the modulation scheme andchannel coding rate for the channel condition. The S-GW 130 is an entityto provide data bearers and establishes and releases data bearers underthe control of the MME 125. The MME 125 is responsible for variouscontrol functions and connected to a plurality of eNBs 105, 110, 115,and 120.

FIG. 2 is a diagram illustrating a protocol stack of an LTE systemaccording to an exemplary embodiment of the present invention.

Referring to FIG. 2, the protocol stack of the LTE system includesPacket Data Convergence Protocol (PDCP) 205 and 240, Radio Link Control(RLC) 210 and 235, Medium Access Control (MAC) 215 and 230, and Physical(PHY) 220 and 225. The PDCP 205 and 240 is responsible for IP headercompression/decompression. The RLC 210 and 235 is responsible forsegmenting the PDCP Protocol Data Unit (PDU) into segments inappropriate size for Automatic Repeat Request (ARQ) operation. The MAC215 and 230 is responsible for establishing connection to a plurality ofRLC entities so as to multiplex the RLC PDUs into MAC PDUs anddemultiplex the MAC PDUs into RLC PDUs. The MAC PDUs are delivered tothe PHY 220 and 225. The MAC 215 and 230 demultiplexes the MAC PDUs fromthe PHY 220 and 225 into RLC PDUs and delivers the RLC PDUs tocorresponding RLC entities. The PHY 220 and 225 performs channel codingand modulation on the higher layer data to transmit the modulationresult through a radio channel in the form of OFDM symbols anddemodulation and channel decoding on the OFDM symbols received throughthe radio channel to deliver the decoded data to the higher layer. ThePHY also performs Hybrid Automatic Repeat Request (HARQ) for additionalerror correction with the transmission of 1 bit information from thereceiver to the sender to indicate whether the packet is received by thereceiver successfully. This information is referred to as HARQ ACK/NACK.The downlink HARQ ACK/NACK corresponding to uplink transmission iscarried on Physical HARQ indicator Channel (PHICH) while the uplink HARQACK/NACK corresponding to downlink transmission is carried on PhysicalUplink Control Channel (PUCCH) or Physical Uplink Shared Channel(PUSCH).

FIG. 3 is a diagram illustrating frequency bands for use in 3GPPcellular communication systems that are adjacent to the Industrial,Scientific, and Medical (ISM) band according to an exemplary embodimentof the present invention.

Referring to FIG. 3, the in-device coexistence interference becomesworse in a situation where a cell uses band 40 and a WLAN uses channel 1or where the cell uses band 7 and the WLAN uses channel 13 or 14. Suchin-device coexistence interference varies dynamically depending on thelocations and channels of the cells, the channels of the WLANs, andtraffic pattern. Therefore, there is a need of a method for notifyingthe network of the in-device coexistence interference, and it ispreferred to report the inter-vice coexistence interference only whenthe network is capable of handling the interference.

FIG. 4 is a signal flow diagram illustrating signal flows among a UE andeNBs in an in-device coexistence interference indication control methodaccording to an exemplary embodiment of the present invention.

Referring to FIG. 4, the serving eNB 403 sends the UE 401 an RRC messagefor determining the functions supported by the UE (i.e. UE capability)at step 411. This RRC message may be a UECapabilityEnquiry message.

Upon receipt of the UECapabilityEnquiry message, the UE 401 sends theserving eNB 403 an RRC message including the UE's capability at step413. This RRC message may be the UECapabilityInformation message. TheUECapabilityInformation message includes a parameter indicatingsupportability of the In-Device Coexistence (IDC) interference (IDCindication or IDC interference indicator, in-device interference betweenheterogeneous modules) report. This parameter is inDeviceCoexInd.

If the network which has received the UECapabilityInformation messagesupports the IDC report function, the network may determine theinter-device coexistence interference based on the IDC report and,otherwise, cannot determine the inter-device coexistence interference ofthe UE, in which case the inDeviceCoexInd parameter is ignored.

Afterward, the serving eNB 403 notifies the UE whether to permit IDCindication transmission of the UE by sending an RRC message at step 421.The RRC message may be the RRCConnectionReconfiguration message, and ifthe RRCConnectionReconfiguration message includes an otherConfigparameter set to idc-Config, the UE determines that the network canperform the IDC-related process and thus sends the network the IDCinterference indicator. Since the IDC interference indicator is used toreport the interference problem between heterogeneous communicationmodules operating on specific frequencies, the UE recognizes that the UEis permitted to transmit the IDC interference indicator only when the UEcan measure the interference among at least two frequencies even thoughthe idc-Config is configured, i.e. measurement object is configured, andthen sends an acknowledgement informing of successful receipt of the RRCmessage at step 423. This acknowledgement message may be theRRCConnectionReconfigurationComplete message.

If the UE has the IDC interference indicator transmission capability andif the network permits IDC interference indicator transmission of theUE, and if in-device coexistence interference is detected, the UE sendsthe network an IDC interference indicator message at step 425.

Meanwhile, if the received signal strength weakens in the serving eNB403, the UE 401 measures, under UE-specific conditions, the signalstrength of the serving and neighbor eNBs and reports the signalmeasurement result to the serving eNB 403 for handover at step 431. Uponreceipt of the measurement report, the serving eNB 403 sends a neighbor(target) eNB 405 a handover request message at step 433. The serving eNB403 notifies the target eNB 405 that the UE supports IDC interferenceindicator report.

Upon receipt of the handover request message, the target eNB 405 sendsthe serving eNB 403 a handover request acknowledge message at step 435.If the target eNB 405 permits the IDC interference indicatortransmission of the UE, the target eNB 405 transmits to the serving eNB403 a parameter indicating the IDC interference indicator transmissionpermission in the handover request acknowledgement message.

Upon receipt of the handover request acknowledgement message, theserving eNB 403 sends the UE a message including the indicatorindicating whether the target eNB 405 permits the IDC interferenceindicator transmission at step 437. This message can be theRRCConnectionReconfiguration message.

The UE performs handover to the target eNB 405 and acquiressynchronization with the target eNB 405 at step 441 and, if handover hascompleted successfully, sends the target eNB 405 a handover completemessage at step 443.

Similar to step 425, the UE sends the target eNB 405 the IDCinterference indicator message reporting the in-device interferenceproblem at step 445 only when the UE has the IDC interference indicatortransmission capability and the target eNB permits IDC interferenceindicator transmission of the UE, if in-device interference is detectedbetween the measured frequencies.

FIG. 5 is a flowchart illustrating a UE procedure of an in-devicecoexistence interference indication control method according to anexemplary embodiment of the present invention.

Referring to FIG. 5, the UE receives the UECapacityEnquiry message fromthe eNB at step 503. Upon receipt of the UECapacityEnquiry message, theUE determines whether the UE has the IDC interference indicatortransmission capability at step 505. If the UE has no IDC interferenceindicator transmission capability, the UE sends the eNB theUECapabilityInformation message including no IDC interference indicatorinformation at step 509.

Otherwise, if the UE has the IDC interference indicator capability, theUE sends the eNB the UECapabilityInformation message including theinformation on whether it supports the IDC interference indicatortransmission at step 507. The UE receives anRRCConnectionReconfiguration message at step 511. TheRRCConnectionReconfiguration message may be used for normalconfiguration and/or for handover.

If the IDC interference indicator message transmission is permitted withthe idc-related configuration in the RRCConnectionReconfigurationmessage at step 513, the UE determines whether the message includes ahandover command at step 515 and, if no handover command is included,sends the serving eNB the IDC interference indicator message informingof the IDC interference at step at step 517. Otherwise if the handovercommand is included, the UE performs handover to the target eNB andsends the IDC interference indicator message informing of the IDCinterference to the target eNB at step 519 rather than the serving eNB.

FIG. 6 is a flowchart illustrating an eNB procedure of an in-devicecoexistence interference indication control method according to anexemplary embodiment of the present invention.

Referring to FIG. 6, if the serving eNB needs to determine the UEcapability, the serving eNB sends the UE a UECapabilityEnquiry messageto request for the UE capability at step 603. The serving eNB receives aUECapabilityInformation message from the UE inresponsetotheUECapabilityEnquiry message at step 605. The eNB determineswhether the eNB supports the UE's IDC interference indicatortransmission at step 607. If the eNB supports the UE's IDC interferenceindicator transmission, the serving eNB continues the procedure and,otherwise, ends the procedure.

If the eNB supports the UE's IDC interference indicator transmission,the eNB determines whether the UE's handover is required at step 609. Ifno UE's handover is required, the eNB sends the UE anRRCConnectionReconfiguration message including the informationindicating whether it permits IDC interference indicator transmission atstep 611. The eNB receives an RRCConnectionReconfigurationCompletemessage from the UE in response to the RRCConnectionReconfigurationmessage at step 613 and, if IDC interference problem occurs at the UE,an IDC interference indicator message is received and the eNB takes anappropriate action (e.g. sends handover command to use anotherfrequency) based on the IDC interference indicator message at step 615.

If the UE's handover is required, the serving eNB sends the target eNB ahandover request message including the UE's IDC interference indicatorcapability information at step 621. The serving eNB receives a handoverrequest acknowledgement message from the target eNB at step 623 anddetermines whether the target eNB supports the UE's IDC interferenceindicator transmission at step 625. If the target eNB supports the UE'sIDC interference indicator transmission, the target eNB sends the targeteNB a handover command including the indicator indicating whether theIDC interference indicator transmission is permitted at step 627.

FIG. 7 is a block diagram illustrating a configuration of a UE accordingto an exemplary embodiment of the present invention.

As shown in FIG. 7, the UE according to an exemplary embodiment of thepresent invention includes a transceiver 705, a controller 710, amultiplexer/demultiplexer 720, a higher layer processor 725, a controlmessage processor 730, and an interference communication technologydetector/determiner 740.

The transceiver 705 receives data and control signals through a downlinkchannel of the serving cell and transmits data and control signalthrough an uplink channel. In the case that multiple serving cells areconfigured, the transceiver 705 is capable of transmitting and receivingdata con control signals through multiple serving cells.

The multiplexer/demultiplexer 720 multiplexes the data generated by thehigher layer processor 725 and the control message processor 735 anddemultiplexes the data received by the transceiver 705 to deliver thedemultiplexed data to appropriate processors, i.e. the higher layerprocessors 725 and the control message processor 735.

The control message processor 735 processes the control message receivedform the eNB to takes an appropriate action. For example, if DRX-relatedparameters are received, the control message processor 735 deliversthese parameters to the controller 710.

The higher layer processor 725 is configured per service to process thedata generated by a user service such as File Transfer Protocol (FTP)and Voice over Internet Protocol (VoIP), transfer the processed data tothe multiplexer/demultiplexer 720, process the data from themultiplexer/demultiplexer 720, and deliver the processed data to theservice application running on the higher layer.

The controller 710 determine the scheduling command, e.g. uplink grant,received by the transceiver 705 and controls the transceiver 705 and themultiplexer/demultiplexer 720 to perform uplink transmission withappropriate transmission resource at appropriate timing. The controller710 also controls the transceiver in association with DRX operation andCSI/SRS transmission.

Exemplary embodiments the present invention have been described aboveunder the assumption that the interference communication technologydevice 745 includes Wi-Fi, Bluetooth, GPS modules and, according to theexplicit interference indication method according to exemplaryembodiments of the present invention, the interference communicationtechnology detector 740 determines the interference and supportabilityof the network to determine whether to transmit and IDC interferenceindicator message.

The above-describe function may be implemented in the controller 710and, in this case, the controller is capable of receiving the UEcapability enquiry message, determining whether the UE supports thein-device interference report capability, and transmitting the UEcapability information message including the IDC interference indicatorto the eNB. The controller 710 is also capable of controlling to receivethe RRC Connection Reconfiguration message including the informationindicating whether the UE's IDC interference indicator transmission ispermitted from the eNB and transmit the RRC Connection ReconfigurationComplete message to the eNB in response to the RRC ConnectionReconfiguration message. The controller 710 is also capable ofdetermining whether in-device coexistence interference occurs in the UEand, if so, controlling to transmit the IDC interference indicator tothe eNB.

According to an exemplary embodiment of the present invention, thecontroller 710 is capable of processing the handover command transmittedby the eNB and, in this case, the handover command is capable ofincluding an indicator indicating whether the target network permits theIDC interference indicator transmission.

According to an exemplary embodiment of the present invention, the RRCConnection Reconfiguration message is capable of further includinginformation on the frequency to which the IDC interference indicator isapplied.

FIG. 8 is a block diagram illustrating a configuration of an eNBaccording to an exemplary embodiment of the present invention.

Referring to FIG. 8, the eNB according to an exemplary embodiment of thepresent invention includes a transceiver 805, a controller 810, ascheduler 815, a multiplexer/demultiplexer 820, various higher layerprocessors 825 and 830, and a control message processor 835.

The transceiver 805 transmits data and control signals on a downlinkcarrier and receives data and control signals on an uplink carrier. Inthe case that multiple carriers are configured, the transceiver 805transmits and receives the data and control signals on the multiplecarriers.

The multiplexer/demultiplexer 820 multiplexes the data generated by thehigher layer processors 825 and 830 and the control message processor835 and demultiplexes the data received by the transceiver 805 todeliver the demultiplexed data to at least one of the higher layerprocessors 825 and 830 and the control message processor 835 and thecontroller 810. The control message processor 835 processes the messagetransmitted by the UE and takes a necessary action or generates acontrol message to be transmitted to the UE to the higher layer.

The higher layer processors 825 or 830 are configured per UE per serviceto process the data generated by a user service such as File TransferProtocol (FTP) and Voice over Internet Protocol (VoIP), and transfer theprocessed data to the multiplexer/demultiplexer 820, process the datafrom the multiplexer/demultiplexer 820, and deliver the processed datato the service application running on the higher layer.

The controller 810 determines the UE's CSI/SRS transmission timing andcontrols the transceiver based on the determination result.

The controller 810 transmits a UE capability enquiry message to the UEand, if a UE capability information message is received from the UE,determines whether the UE capability information message includes theheterogeneous communication module interference occurrence indicator(IDC interference indicator). If the IDC interference indicator isincluded, the controller 810 determines whether the UE's IDCinterference indicator transmission is permitted and, if so, transmitsto the UE an RRC connection reconfiguration message including theinformation indicating whether the UE's IDC interference indicatortransmission is permitted.

The controller 810 also determines whether UE's handover is requiredand, if so, controls to transmit to the target eNB a handover requestmessage including the information on whether the UE's IDC interferenceindicator transmission capability. The controller 810 receives ahandover request acknowledgement message including the information onwhether the target eNB supports the IDC interference indicatortransmission from the target eNB and, if the target eNB supports the IDCinterference indicator transmission, controls to transmit to the UE ahandover command message including the indicator indicating whether thetarget eNB supports the IDC interference indicator transmission.

The scheduler 815 allocates transmission resource to the UE at anappropriate time in consideration of the buffer status of the UE,channel status, and active time of the UE, and controls the transceiverto process the signals transmitted by the UE or to be transmitted to theUE.

As described above, the in-device coexistence interference indicationcontrol method according to exemplary embodiments of the presentinvention is capable of preventing the UE from transmitting uselessin-device coexistence interference indication message, resulting inreduction of unnecessary signaling.

While the invention has been shown and described with reference tocertain exemplary embodiments thereof, it will be understood by thoseskilled in the art that various changes in form and details may be madetherein without departing from the spirit and scope of the invention asdefined by the appended claims and their equivalents.

What is claimed is:
 1. A control message transmission method of a userequipment (UE) in a mobile communication system, the method comprising:transmitting, to a base station, first information indicating whetherthe UE supports an in device coexistence (IDC) indication, wherein anIDC is an interference between multiple radio transceivers in the UE;receiving configuration information corresponding to the IDC indication;determining whether an IDC problem is experienced in the UE; andinitiating transmission of the IDC indication, if the configurationinformation is set to setup and if the IDC problem is experienced in theUE.
 2. The method of claim 1, further comprising: receiving a handovercommand from the base station, wherein the handover command includesinformation on whether the transmission of the IDC indication for atarget network is set to setup or not.
 3. The method of claim 1, whereinthe first information indicating whether the UE supports the IDCindication is an inDeviceCoexInd parameter.
 4. The method of claim 1,further comprising: receiving second information on a frequency to whichan IDC interference indicator is applied.
 5. A user equipment (UE) fortransmitting a control message in a mobile communication system, the UEcomprising: a transceiver for transmitting and receiving signals; and aprocessor configured to: control to transmit, to a base station, firstinformation indicating whether the UE supports an in device coexistence(IDC) indication, wherein an IDC is an interference between multipleradio transceivers in the UE, receive configuration informationcorresponding to the IDC indication, determine whether an IDC problem isexperienced in the UE, and initiate transmission of the IDC indication,if the configuration information is set to setup and if the IDC problemis experienced in the UE.
 6. The UE of claim 5, wherein the processor isconfigured to control to receive a handover command from the basestation, and wherein the handover command includes information onwhether the transmission of the IDC indication for a target network isset to setup or not.
 7. The UE of claim 5, wherein the first informationindicating whether the UE supports the IDC indication is aninDeviceCoexInd parameter.
 8. The UE of claim 5, wherein the processoris configured to control to receive second information on a frequency towhich an IDC interference indicator is applied.